东北师范大学王恒国团队研究了超低温（-70 ℃）快速氧化还原动力学的供体-受体多孔芳香骨架阴极钾-有机电池。该项研究成果发表在2025年6月26日出版的《德国应用化学》杂志上。

低温可充电电池对于低温储能至关重要。然而，降低工作温度将加剧无机电极材料反应动力学减慢和机械不稳定的缺点，从而导致严重的容量退化。在这项工作中，研究组首次证明，使用p型吩嗪（PZ）和n型六氮杂三萘（HATN）作为存储块构建供体-受体（D-A）多孔芳香框架（PAF-310）可以加速电荷传输，从而促进反应动力学，即使在低温条件下也是如此。 

当用作钾离子电池（PIB）的阴极时，PAF-310具有比同类电池更高的电化学性能，包括在25℃下令人印象深刻的放电比容量（0.2 A g^-1时为215.6 mAh g^-1）和出色的倍率性能（50 A g^-1下为77.8 mAh g^-1）。此外，PAF-310在低温条件下也能提供令人印象深刻的比容量（-20℃时为168.2 mAh g^-1，-40℃时为130.1 mAh g^-2，0.2 A g^-1）。

即使在-70℃下，PAF-310仍表现出良好的比容量（50 mA g^-1时为102.2 mAh g^-1）。此外，还采用了各种原位/异位光谱特征和理论计算来阐明PAF-310中K⁺和PF6-的连续共存储机制。这一贡献为低温稳定PIB提供了一种可行的分子设计策略。

附：英文原文

Title: Donor-Acceptor Porous Aromatic Framework Cathode with Fast Redox Kinetics for Ultralow-Temperature (-70 ℃) Potassium-Organic Batteries

Author: Jie Yu, Xupeng Zhang, Yuying Liu, Linqi Cheng, Heng-Guo Wang, Fengchao Cui, Guangshan Zhu

Issue&Volume: 2025-06-26

Abstract: Low-temperature rechargeable batteries are essential for cryogenic energy storage. However, lowering the working temperature will exacerbate the disadvantages of slowed reaction kinetics and mechanical instability of inorganic electrode materials, thus causing severe capacity degradation. In this work, for the first time, we demonstrated that constructing a donor-acceptor (D-A) porous aromatic framework (PAF-310) using p-type phenazine (PZ) and n-type hexaazatrinaphthylene (HATN) as storage blocks can accelerate charge transport and thus facilitate the reaction kinetics even at low-temperature conditions. When employed as the cathode of potassium ion batteries (PIBs), PAF-310 possesses higher electrochemical performance than its counterparts, including impressive discharge specific capacity (215.6 mAh g-1 at 0.2 A g-1) and outstanding rate performance (77.8 mAh g-1 at 50 A g-1) at 25 ℃. Furthermore, PAF-310 also delivers impressive specific capacities in low-temperature conditions (168.2 mAh g-1 at -20 ℃ and 130.1 mAh g-1 at -40 ℃ at 0.2 A g-1). Even at -70 ℃, PAF-310 still exhibits good specific capacity (102.2 mAh g-1 at 50 mA g-1). Moreover, various in/ex-situ spectral characterizations and theoretical calculations were employed to elucidate the continuous co-storage mechanism of K+ and PF6- in PAF-310. This contribution sheds a feasible molecular design strategy towards low-temperature stabilized PIBs.

DOI: 10.1002/anie.202507570

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202507570